1987-1993 Mercury Mariner 90HP 3-Cylinder Outboard OEM Service & Repair Manual

GENERAL INFORMATION AND SPECIFICATIONS 1

90-13645-2 495 Table Of Contents Page Page General Specification 1-1 . . . . . . . . . . . . . . . . . . . . . . Cowl Removal 1-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Filling Oil Injection System 1-3 . . . . . . . . . . . . . . . . . . Power Trim General Information 1-4 . . . . . . . . . . . . . Trim “In” Angle Adjustment 1-4 . . . . . . . . . . . . . . . . . Models with Power Trim 1-4 . . . . . . . . . . . . . . . . Checking Trim System Fluid Level 1-5 . . . . . . . . . . . Tilt Angle Adjustment 1-5 . . . . . . . . . . . . . . . . . . . . . . Models without Power Trim 1-5 . . . . . . . . . . . . . . Connecting Engine Wiring Harness and Routing of Engine Battery Cables 1-6 . . . . . . . . Ride-Guide Steering Cable and Pivot Points Lubrication 1-7 . . . . . . . . . . . . . . . . . Following Complete Submersion 1-8 . . . . . . . . . . . . Salt Water Submersion (Special Instructions) 1-8 . . . . . . . . . . . . . . . . Submerged While Running (Special Instructions) 1-8 . . . . . . . . . . . . . . . . Submerged Engine (Fresh Water) (Plus Special Instructions) 1-8 . . . . . . . . . . . Out-of-Season Outboard Storage 1-9 . . . . . . . . . . . How Weather Affects Engine Performance 1-10 . . Conditions Affecting Operation 1-11 . . . . . . . . . . . . . Detonation: Causes and Prevention 1-12 . . . . . . . . Compression Check 1-12 . . . . . . . . . . . . . . . . . . . . . .

1-1 90-13645--2 1095 GENERAL INFORMATION AND SPECIFICATIONS General Specification NOTE: Other specification (torques, etc.) are listed in the respective sections. Model 70 Model 75 Model 80 Model 90 Horsepower 70 (52.2 kw) 75 (55.9 kw) 80 (59.6 kw) 90 (67.1 kw) Idle RPM (in forward gear) 650 - 700 Full Throttle RPM Range 4750 - 5250 5000 - 5500 Piston Replacement 71.12 (1165.7cc) Cylinder Bore 3.375 (85.7mm) Stroke 2.65 (67.3mm) Engine Type 3 Cylinder, 2 Cycle Ignition Type C.D. Breakerless Recommended Spark Plug NGK-BUHW-2 or AC-V40 FFK or Champion L78V Inductor Plugs: NGK-BUZHW-2 or Champion QL78V Cylinder Firing Order 1-3-2 Recommended Power Trim Fluid Quicksilver Power Trim & Steering Fluid or Automotive Transmission Fluid (ATF) Type F, FA or Dexron II Recommended Gasoline Regular Leaded, Premium, Low-Lead and Lead-Free automotive gaso- lines with a minimum pump posted octane rating of 86 Recommended Oil Quicksilver TC-WII or TC-W3 2-Cycle Outboard Oil Engine Weight ELO ELOPT 260 lbs. 280 lbs. Fuel Tank Capacity 6.6 U.S. Gallons (5 Imp. Gals.; 25 Liters) Gear Housing Lubricant Capacity 22.5 fl. oz. (665.3ml) Gasoline/Oil Ratio at Idle 80:1 Gasoline/Oil Ratio at W.O.T. 50:1 Gear Ratio 2.3:1 Oil Injection Tank Capacity Tank Capacity 1 gal. (3.78 liter) Maximum operation per tank full of oil at W.O.T. 6 hours Oil remaining when warning buzzer sounds 1 qt. (.95 liter) Operating time remaining at wide open throttle when warning buzzer sounds 1 Hour

1-2 90-13645--2 1095 GENERAL INFORMATION AND SPECIFICATIONS General Specification (continued) NOTE: Other specification (torques, etc.) are listed in the respective sections. Model 100 Model 115 Horsepower 100 (74.6 kw) 115 (85.8 kw) Idle RPM (in forward gear) 650 - 700 Full Throttle RPM Range 4750 - 5250 Piston Replacement 105 (1720.9cc) Cylinder Bore 3.375 (85.7mm) Stroke 2.930 (74.4mm) Engine Type 4 Cylinder, 2 Cycle Ignition Type C.D. Breakerless Recommended Spark Plug NGK-BPH8H-N-10* Gap - 0.040 in. (1.0mm) Inductor Plug NGK BPZ 8H-N-10* Gap - 0.040 in. (1.0mm) NGK-BUHW Cylinder Firing Order 1-3-2-4 Recommended Power Trim Fluid Quicksilver Power Trim & Steering Fluid or Automotive Transmission Fluid (ATF) Type F, FA or Dexron II Recommended Gasoline Regular Leaded, Premium, Low-Lead and Lead-Free automotive gaso- lines with a minimum pump posted octane rating of 86 Recommended Oil Quicksilver 2-Cycle Outboard Oil Engine Weight ELO ELOPT 340 lbs. 360 lbs. Fuel Tank Capacity 6.6 U.S. Gallons (5 Imp. Gals.; 25 Liters) Gear Housing Lubricant Capacity 22.5 fl. oz. (665.2ml) Gasoline/Oil Ratio at Idle 80:1 Gasoline/Oil Ratio at W.O.T. 50:1 Gear Ratio 2.07:1 Oil Injection Tank Capacity Tank Capacity 1.4 gal. (5.3 liters) Maximum operation per tank full of oil at W.O.T. 5 hours Oil remaining when warning buzzer sounds 1 qt. (.95 liter) Operating time remaining at wide open throttle when warning buzzer sounds 50 min. approx. *Improves running quality between 1800 – 2000 RPM.

90-13645--2 495 1-3 GENERAL INFORMATION AND SPECIFICATIONS Cowl Removal Pull outward on starboard side of front shield (a). Remove spring (b) from latch and open cowls. 18291 a 18292 b Filling Oil Injection System Open starboard cowl (refer to cowl removal on this page). Some earlier outboards will have a cowl brack- et to hold cowl open as shown. Fill tank with recommended oil. a a - Oil Tank Tube

1987-1993 Mercury Mariner 90HP 3-Cylinder Outboard OEM Service & Repair Manual

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